jjmmagoo
PS3 needs no battery so no replacing them after the years eat them.
also, they have a custom ASIC chip which gives better signal pickup than the old chip.
This means better signal response, more so if paired with the new Rev L TIU which also has a new ASIC.
Bottom line: fewer problems over the years can be expected with PS3 VS PS2.
There have been a few teething problems with the new engines. I forget exactly which ones, but some have had a point inside the paint needed scrubbed off under a screw for a good ground and some folks have had issues with the new Drawbar.
The Drawbar on a few engines did not stay snapped in place well.
I have a PS3 Northern and those were one of the engines with the drawbar issue, However I have had Zero problems with mine.
Possibly this is because it rarely gets picked up. Leaving them on the track connected seems to be a good thing with the new drawbar.
